Terahertz imaging method based on spiral phase contrast imaging and device

A technology of terahertz imaging and phase contrast imaging, which is applied in the field of terahertz quasi-optical imaging, can solve the problems of low contrast and small difference between terahertz transmission/reflectivity, etc., achieve high-contrast imaging, and realize terahertz high-contrast imaging , Realize the effect of real-time imaging

Inactive Publication Date: 2020-02-21
INST OF ELECTRONICS CHINESE ACAD OF SCI
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However, the contrast of terahertz biomedical images is often very low, mainly due to the high water content of biological tissues, water has a str

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  • Terahertz imaging method based on spiral phase contrast imaging and device
  • Terahertz imaging method based on spiral phase contrast imaging and device
  • Terahertz imaging method based on spiral phase contrast imaging and device

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[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0022] At present, most traditional terahertz biomedical imaging methods have low imaging contrast and poor imaging quality. The present invention aims to introduce spiral phase contrast imaging in optical imaging into terahertz imaging to improve imaging contrast. Compared with traditional imaging methods, helical phase contrast imaging combines the imaging objective function with the phase factor The convolution operation is performed so that the pixels in the uniform area in the target image become 0, and the boundaries of different intensity or phase areas are highlighted, thereby achieving imaging contrast enhancement. The imaging system uses a terahertz camera as a receiver, which can realize real-time high-contra...

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Abstract

The invention provides a terahertz imaging method based on spiral phase contrast imaging and a device. The terahertz imaging method includes the following steps: a collimated terahertz wave beam is subjected to target transmission to obtain a first transmission wave beam; after the first transmission wave beam is travelled for a distance f, modulation is performed by using a first lens to obtain asecond transmission wave beam; after the second transmission wave is travelled for a distance f, modulation is performed by using a spiral phase plate located on a frequency spectrum plane to obtaina third transmission wave beam; after the third transmission wave beam is travelled for a distance f, modulation is performed by using a second lens to obtain a fourth transmission wave beam; and after the fourth transmission wave beam is travelled for a distance f and received by a terahertz camera, imaging is realized. The method introduces the spiral phase contrast imaging technology into terahertz imaging, and the spiral phase contrast imaging can realize the characteristic of high contrast imaging, so that the terahertz high contrast imaging is realized.

Description

technical field [0001] The invention relates to the technical field of terahertz quasi-optical imaging, in particular to a terahertz imaging method and device based on spiral phase contrast imaging. Background technique [0002] Terahertz waves have a certain penetrating ability to biological tissues, and the single photon energy is low, and will not cause ionization of biological tissues. It is very safe in biomedical imaging and is suitable for biomedical imaging. However, the contrast of terahertz biomedical images is often very low, mainly due to the high water content of biological tissues, water has a strong absorption of terahertz waves, and some different types of biological tissues have little difference in the transmission / reflection of terahertz. Therefore, there is an urgent need to study terahertz high-contrast imaging methods. Spiral phase-contrast imaging technology is widely used in optical imaging. Compared with common imaging methods, spiral phase-contrast...

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Application Information

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IPC IPC(8): A61B5/05
CPCA61B5/0507
Inventor 吴世有刘辉李超常超方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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